The graph shows the effect of increasing the concentration of glucose in a solution on the rate of entry of glucose into a cell.
What are not causes of the plateau at X?
1 All the carrier proteins are saturated with glucose.
2 The carrier proteins are denatured and no longer able to function.
3 The cell has used up its supply of ATP.
4 The concentrations of glucose inside and outside the cell are equal.
1 )
1, 2 and 4
2, 3 and 4
3 )
2 and 3 only
4 )
1 only
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